Modelling and validation of an inverter featuring local voltage control Q(V) for transient stability and interaction analyses

This paper establishes two accurate inverter models featuring local voltage control Q(V): a non-linear Simulink model and a small signal model. While the non-linear model can be used to perform arbitrary analyses of transient events, the small signal model's purpose is to be incorporated in grid models to study small signal stability and possible interactions. Both models are build bottom up from grid filter and PWM to the cascaded power controllers and Q(V) and are designed in dq0 components. High resolution laboratory measurements are used for verification and design parameters are specified to assure reproducibility. The emerging small signal model can be interpreted as a dynamic admittance and therefore easily be included in power system stability analyses.